You know he's not the one for you.  But, he is calling you and telling you how important you are, how he's making major decisions for you, etc. That can be really seductive.  You need to NOT LISTEN!!  Get caller-ID, screen your calls, do something, but avoid him.  It might help to write a letter to him.  I'll help you start it:

"You betrayed me when you started our relationship under false pretenses. In addition, I have seen how you have betrayed your wife and that is not a future I am going to plan for myself.  Therefore, I need you to leave me alone and not contact me.  I wish you the best of luck and hope that you can grow up and begin making more mature decisions for yourself, but I WILL NOT BE AROUND when you do."

You can mail it or not, depending on how you feel.  But do not in anyway give him an indication that you still are interested - even if part of you is.

Maybe he is simply being misled by her ambiguity.

§ This guy will use that to manipulate you back into seeing him.

Now, you've learned something.  You've learned that you are totally iresistable to a jerk.  Take the time for yourself to realize that while this guy turned out to not be the one for you, there will be other people in your future who are not jerks and who find you totally iresistable. Probably not while you are mourning the loss of this relationship, though.  So you may want to take some measures to get over it as quickly as possible (and no contact whatsoever is one step on that road).